Cylinder lock



0d. 30, 1934. A, BRAUMNG 1,979,095

CYLINDER LOCK .Filed Feb. 25. 1929 INVENTOR ATTORNEY Patented Oct. 30, 1934 TENT or ice CYLINDER LOOK Karl A. Brauning, Stamford, Conn, assignor to The Yale & Towne Manufacturing Company,

Stamford, Conn.

Application February 23, 1929, Serial No. 341,964

6 Claims.

My invention relates to cylinder locks of the sliding tumbler plug type adapted to be used in automobile locks. It is very desirable in automobile work that the plug portion of each lock conistitute an independent unit to be put into its respective cylinder at the end of the automobile assembly line. It is also desirable to arrange the plugs so that they are interchangeable in the various cylinders and are capable of being taken out of the cylinders without dismantling the entire lock.

The object of my invention, therefore, is to devise a sliding tumbler cylinder lock, in which the plugs are interchangeable and may be inserted or removed from the cylinder with extreme ease.

My invention is shown more particularly in the drawing where Fig. l is a view of my cylinder lock with the key inserted. Fig. 2 is a cut-away view of my cylinder lock showing the plug in its position relatively to the cylinder. Fig. 3 is an end view of the cylinder showing the cam arrangement on the cylinder wall to permit easy insertion of the plug. Fig. 4 is a section along the line 44 of Fig. 2. Fig. 5 is a front, side, and end view of the plug.

Referring more particularly to the drawing, reference numeral indicates my cylinder, in which the plug 11 is adapted to operate. This plug 11 is equipped With an operating cam 12,

Land a group of locking tumblers 13, which are to be operated in the usual manner well known in the art. In adapting this usual type of plug for my invention, I have drilled it at point 14, and

grooved it at 15 for the insertion of a wire retain- .Iing member 16. This retaining wire 16 is run through the bore 14 and then is bent around the grooved portion 15, so as to leave a raised section of the wire outside the periphery of the plug.

In order to obtain an easy insertion of the :plug into the cylinder, I have milled a portion of the cylinder wall at the point 17a so that when the end of the plug is inserted, this portion 17a will cam the spring retainer fully within the groove 15 to permit the further sliding of the plug into operating position as shown in Fig. 2.

If, in the operation of the car, it becomes necessary to change the plug, it is merely necessary to insert the proper key and then rotate the plug 90 from the position of Fig. 4. This will bring .the raisedportion of the retaining wire 16 opinterchange the plugs of the various cylinders, Without difficulty. It furthermore insures the use of the key before such interchanging is possible, by compelling the 90 key rotation from the initial position of Fig. 4. This of course, is to prevent unauthorized removal of the plug. While I have shown a particular embodiment in my invention, I do not wish to be limited to the exact structure of the same since modifications will be clear to one skilled in the art.

I claim:

1. In a cylinder look, a plug, a spring retainer carried by said plug and co-operable with a groove in the cylinder, a bore in the cylinder whereby said retainer may be operated from the outside of the cylinder, said retainer being maintained inaccessible for outside operation when the plug is in locked condition.

2. In a cylinder look, a plug, a spring wire carried by said plug and co-operable with a groove in the cylinder to maintain the plug within said cylinder, a bore in the cylinder wall whereby said retainer may be operated, said retainer being maintained out of the plane of the bore when the plug is in locked position, said plug being key operable to bring said spring wire opposite said bore.

3. In a cylinder lock, in combination, a key plug, an outwardly pressing retainer carried by the plug and cooperable with the cylinder to maintain the plug within a plug bore in said cylinder, a cam section located on a portion of the periphery of said plug bore, said section being effective to cam the retainer into the plug upon relative rotary movement of the plug and cylinder so as to permit entrance of the plug into the cylinder.

4. In a cylinder lock, in combination, a key plug, a retainer. carried by said plug and pressing outwardly therefrom, said retainer being co-operable with the cylinder for retaining the plug in a plug bore of said cylinder, said bore having a pair of tumbler locking grooves, a camming sector cut out on the periphery of said plug bore and located between said pair of grooves, said sector being effective to cam the retainer into the plug upon relative rotary and endwise movement of the plug and cylinder so as to permit entrance of the plug into the cylinder.

5. In a cylinder lock having a plug bore, in combination, a key plug, an outwardly pressing retainer carried by the plug and adapted to spring outwardly therefrom into a groove in the plug bore of said cylinder lock for retaining the plug therein, a cam section located on a portion of the periphery of said plug bore, said section being effective to cam said retainer into the plug upon movement of the plug relatively to the cylinder whereby to permit full inward movement of said plug.

6. A look of the character described, comprising a bored mounting member, a lock cylinder insertable into the mounting member bore, locking means mounted in the cylinder for movement in planes substantially perpendicular and transverse to the axis of the cylinder and normally prov 

